"""
# Copyright (c) 2025 PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""

import asyncio
from dataclasses import MISSING, asdict, dataclass, field, fields
from enum import Enum
from typing import Any, List, Union

import aiohttp
import requests


class InstanceRole(Enum):
    MIXED = 0
    PREFILL = 1
    DECODE = 2


@dataclass
class InstanceInfo:
    role: Union[InstanceRole, str]
    host_ip: str
    port: Union[int, str]
    connector_port: Union[int, str] = 0
    engine_worker_queue_port: Union[int, str] = 0
    transfer_protocol: List[str] = field(default_factory=list)
    rdma_ports: Union[List[str], List[int]] = field(default_factory=list)
    device_ids: Union[List[str], List[int]] = field(default_factory=list)
    tp_size: int = 1

    @classmethod
    def from_dict(cls, info_dict: dict[str, Any]) -> "InstanceInfo":
        """Create instance from dict arguments"""
        kwargs = {}
        for field_def in fields(cls):
            name = field_def.name
            if name in info_dict:
                value = info_dict[name]
            else:
                # handle default and default_factory
                if field_def.default is not MISSING:
                    value = field_def.default
                else:
                    value = field_def.default_factory()
            kwargs[name] = value
        return cls(**kwargs)

    def __post_init__(self):
        """check and unify fields"""
        if isinstance(self.role, str):
            try:
                self.role = InstanceRole[self.role.upper()]
            except KeyError:
                raise ValueError(f"Invalid role string: {self.role}")
        elif not isinstance(self.role, InstanceRole):
            raise TypeError(f"role must be InstanceRole or str, got {type(self.role)}")

        for t in self.transfer_protocol:
            assert t in ["ipc", "rdma"], f"Invalid transfer_protocol: {self.transfer_protocol}"

        self.port = str(self.port)
        self.connector_port = str(self.connector_port)
        self.engine_worker_queue_port = str(self.engine_worker_queue_port)
        if self.rdma_ports:
            self.rdma_ports = [str(p) for p in self.rdma_ports]
        if self.device_ids:
            self.device_ids = [str(i) for i in self.device_ids]

    def to_dict(self):
        return {k: (v.name if isinstance(v, Enum) else v) for k, v in asdict(self).items()}

    def url(self) -> str:
        url = f"{self.host_ip}:{self.port}"
        if not url.startswith(("http://", "https://")):
            url = f"http://{url}"
        return url


def check_service_health(base_url: str, timeout: int = 3) -> bool:
    """
    Check the health status of a service.

    Args:
        base_url (str): The base URL of the service, e.g. "http://127.0.0.1:8080"
        timeout (int): Request timeout in seconds.

    Returns:
        bool: True if the service is healthy, False otherwise.
    """
    if not base_url.startswith(("http://", "https://")):
        base_url = f"http://{base_url}"

    url = f"{base_url.rstrip('/')}/health"
    try:
        resp = requests.get(url, timeout=timeout)
        if resp.status_code == 200:
            return True
        else:
            return False
    except Exception:
        return False


async def check_service_health_async(base_url: str, timeout: int = 3) -> bool:
    """
    Asynchronously check the health status of a service.

    Args:
        base_url (str): The base URL of the service, e.g. "http://127.0.0.1:8080"
        timeout (int): Request timeout in seconds.

    Returns:
        bool: True if the service is healthy, False otherwise.
    """
    if not base_url.startswith(("http://", "https://")):
        base_url = f"http://{base_url}"

    url = f"{base_url.rstrip('/')}/health"
    try:
        async with aiohttp.ClientSession(timeout=aiohttp.ClientTimeout(total=timeout)) as session:
            async with session.get(url) as resp:
                status = resp.status
                text = await resp.text()

                if status == 200:
                    print(f"[OK] Service is healthy ({status})")
                    return True
                else:
                    print(f"[WARN] Service not healthy ({status}): {text}")
                    return False
    except aiohttp.ClientError as e:
        print(f"[ERROR] Failed to connect to {url}: {e}")
        return False
    except asyncio.TimeoutError:
        print(f"[ERROR] Request to {url} timed out after {timeout}s")
        return False
